Yarn twisting apparatus



Sept. 3, 1946. o. A. HITT YARN TWISTING- APPARATUS Filed July 10, 1945 Q A- l ll IN VEN TOR.

x ATTORNEY Patented Sept. 3, 1946 UNITED STATES PATENT OFFICE YARN TWISTING APPARATUS Otha A. Hitt, Chesterfield County, Va., assignor to E. I. du Pont de N emours & Company, Wilmington, Del., a corporation of Delaware Application July 10, 1945, Serial No. 604,135

' 1 Claim. 1

This invention relates to the twisting of yarn and more particularly to an improved bobbin cap especially suited for use on an uptwister machine.

An object of my invention is to provide a bobbin cap structure provided with means for locking the cap to the spindle of a twisting machine.

Another object is to provide in a bobbin cap, a simple, inexpensive, efiicient locking device which will not loosen even when rotated at high speeds but which is easily releasable for removal of the bobbin cap from the spindle.

These and additional objects will more clearly appear from the following description which is to be read with reference to the accompanying drawing wherein:

Figure 1 is a sectional view of my improved bobbin cap and locking construction;

Figure 2 is a top plan view of the lock plate; and

Figure 3 is a side elevation of the lock plate.

Referring to the drawing in which like reference numerals designate like parts, reference numeral I indicates a metal bobbin cap of conventional design provided with a bushing 2 and adapted to maintain a yarn package 3 in alignment on a driven spindle 4 of the twisting machine. In the preferred embodiment of my invention, bushing 2 is recessed at the bottom thereof to accommodate the locking mechanism which comprises essentially a lock plate having a hardened metal annulus-shaped section 5 the inner diameter of which is slightly greater than the diameter of the spindle about which it is adapted to fit, a relatively short, downwardly extending lug 6 at the edge of section 5, and a relatively long, upwardly extending lever 1 terminating in a finger tab 8, and disposed at the edge of section 5 at a point diametrically opposed to lug 6. The locking plate is maintained in position in the recess by a base plate 9 attached to the bushing and bobbin cap as by rivets indicated collectively by reference numeral II]. A coil spring fitted over lever l and compressed within the recess urges the lock plate downwardly against the base plate and by reason of the lug 6 the annulus section 5 of the lock plate is thus maintaianed in canted, position causing the inner edge of the annulus to jam against the spindle whereby to lock the bobbin cap to the spindle.

The operator may unlock the cap by simply pressing toward the spindle the finger tab 8 of lever I which extends through the top of the cap, and at the same time lifting the cap from the spindle. As will be apparent from Figure 1 of the drawing, pressure exerted against the finger tab operates to bring the annulus into a horizontal position against the action of the spring and to a point where the inner edge of the annulus no longer jams against the spindle in lockance with the principles of my invention is inexpensive to produce and to maintain in operation.

As many apparently different embodiments of this invention can be made without departing from the spirit and scope thereof, it is to be understood that said invention is not to be restricted save as set forth in the appended claim.

I claim:

In combination, a spindle, a bobbin cap having a bushing adapted to fit on said spindle, the bushing having a central bottom recess, a cover plate for said recess, and locking means disposed in said recess, said means comprising an annulusshaped locking plate resting on said cover plate concentrically disposed with respect to the cap the inner diameter of said plate being slightly greater than the diameter of the spindle, a downwardly projecting lug at one edge of said locking plate causing said plate to rest in a canted position, a lever positioned diametrically opposite said lug rigidly attached at the edge of said locking plate and extending upwardly through said bushing and cap for manually moving said looking plate, and spring means between the locking plate and cap adjacent said lever for maintaining said locking plate in canted position.

OTHA A. HITT. 

